Update gstreamer1 ports to 1.6.0.
* gstreamer1-libav now uses ffmpeg from ports.
* New ports:
* gstreamer1-validate: Tools to detect if elements are not behaving
as expected, mainly aimed at developers, or advanced debugging.
* gstreamer1-rtsp-server: Base foundation for building a rtsp
server ontop of GStreamer
* Bunch of new plugins like: mpg123, rsvg, libde265, openh264, x265 and dtls.
Obtained from: gnome devel repo